<ul>
<?php foreach($this->categories as $item) : ?>
    <li>
      <a href="<?php echo $this->url(
                        array( "cat_id"=>$item['id'],
                               "action"=>"showall",
                               "controller"=>"product"))?>">
        <?php echo $item['name']; ?></a>
        </li>
<?php endforeach; ?>
</ul>